OFFSET
0,4
FORMULA
a(n) = c*2^(2n/3)+O(1) where c = 0.4600594211686036392470119450103830526110335102224661416117198000.... - Benoit Cloitre, Dec 17 2006
EXAMPLE
a(5) = 4 because a(5) = floor(2*sqrt(a(3)*a(4))) = floor(2*sqrt(2*2)) = 4.
MATHEMATICA
Join[{0}, RecurrenceTable[{a[1]==a[2]==1, a[n]==Floor[2Sqrt[a[n-1]a[n-2]]]}, a, {n, 40}]] (* Harvey P. Dale, Jun 14 2014 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Robert A. Stump (rstump_2004(AT)yahoo.com), Apr 25 2004
STATUS
approved